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components and component architecture, use-cases and use-case driven development, SDL, a major contributor to UML, Objectory, RUP, aspect-oriented software development
After university, Jacobson worked at Ericsson until April 1987, when he started Objective Systems. A majority stake of the company was acquired by Ericsson in 1991, and the company was renamed Objectory AB. Jacobson developed the software process OOSE at Objectory circa 1992.
Rational was bought by IBM in 2003 and Jacobson decided to quit, but he stayed on until May 2004 as an executive technical consultant.
In mid-2003 Jacobson formed Ivar Jacobson International (IJI) which is an umbrella company for Ivar Jacobson Consulting (IJC)[2] which operates across 4 continents with offices in the UK, US (West and East Coast), Europe, Scandinavia, China, Korea, Singapore and Australia.
In 1967 at Ericsson Jacobson proposed the use of software components in the new generation of software controlled telephone switchesEricsson was developing. In doing this he invented sequence diagrams, and developed collaboration diagrams. He also used state transition diagrams to describe the message flows between components.
Jacobson saw a need for blueprints for software development. He was one of the original developers of the Specification and Design Language (SDL). In 1967, SDL became a standard in the telecoms industry.
At Ericsson he also invented use cases as a way to specify functional software requirements.
In November 2005, Jacobson announced the Essential Unified Process or “EssUP” for short. EssUP is a new “Practice” centric software development process that stands on the shoulders of modern but established software development best practice. It is a fresh new start, integrating successful practices sourced from the three leading process camps: the unified process camp, the agile software development camp and the process improvement camp. Each one of them contributes different capabilities: structure, agility and process improvement.
In November 2009, Jacobson, Bertrand Meyer and Richard Soley ("the Troika") started an initiative called SEMAT (Software Engineering Method and Theory) to seek to develop a rigorous, theoretically sound basis for software engineering practice, and its wide adoption by industry and academia.
Jacobson has published several books and articles,[3] a selection:
1992. Object-Oriented Software Engineering: A Use Case Driven Approach (ACM Press) With Magnus Christerson, Patrik Jonsson & Gunnar Overgaard. Addison-Wesley, 1992, ISBN 0-201-54435-0
1994. The Object Advantage: Business Process Reengineering With Object Technology (ACM Press). With M. Ericsson & A. Jacobson. Addison-Wesley, ISBN 0-201-42289-1
1997. Software Reuse: Architecture, Process, and Organization for Business Success (ACM Press). With Martin Griss & Patrik Jonsson. Addison-Wesley, 1997, ISBN 0-201-92476-5
2004. Aspect-Oriented Software Development With Use Cases (Addison-Wesley Object Technology Series). With Pan-Wei Ng. Addison-Wesley, ISBN 0-321-26888-1
